/**
 * Copyright 2009 Emory University
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated  documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 
 * and/or sell copies of the Software, and to permit persons to whom the 
 * Software is furnished to do so, subject to the following conditions: The 
 * above copyright notice and this permission notice shall be included in all 
 * copies or substantial portions of the Software. 
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
package com.markgrand.structuredSql

/**
 * Append a column definition to a StringBuilder.
 */
class ColumnDefinition private (val columnName:String,
                                val dataType:SQLDataTypeAppender,
                                val default:Option[SQLValueAppender],
                                val columnConstraints:Seq[ColumnConstraint]) extends SQLAppender with SQLIdentifier {
  if (columnName == null) {
    throw new NullPointerException("columnName may not be null")
  }
  if (dataType == null) {
    throw new NullPointerException("dataType may noe be null.")
  }
  if (default == null) {
    throw new NullPointerException("default may not be null")
  }
  if (columnConstraints == null) {
    throw new NullPointerException("columnConstraints may not be null")
  }
  
  def append(builder:StringBuilder) {
    appendIdentifier(columnName, builder)
    builder.append(" ")
    dataType.append(builder)
    if (default.isDefined) {
      builder.append(" DEFAULT ")
      default.get.append(builder)
    }
    if (columnConstraints.length > 0) {
      builder.append(" ")
      appendSeq(columnConstraints, builder, " ")
    }
  }
}

object ColumnDefinition {
  def apply(columnName:String, dataType:SQLDataTypeAppender) =
    { new ColumnDefinition(columnName, dataType, None, List()) }

  def apply(columnName:String, dataType:SQLDataTypeAppender, default:SQLValueAppender) =
    { new ColumnDefinition(columnName, dataType, Some(default), List()) }

  def apply(columnName:String, dataType:SQLDataTypeAppender, columnConstraints:ColumnConstraint* ) =
    { new ColumnDefinition(columnName, dataType, None, columnConstraints)}
  
  def apply(columnName:String, dataType:SQLDataTypeAppender, default:SQLValueAppender, columnConstraints:ColumnConstraint* ) =
    { new ColumnDefinition(columnName, dataType, Some(default), columnConstraints)}
}